X-Git-Url: http://gitweb.fperrin.net/?p=GpsPrune.git;a=blobdiff_plain;f=src%2Ftim%2Fprune%2Fsave%2Fxml%2FGpxCacher.java;fp=src%2Ftim%2Fprune%2Fsave%2Fxml%2FGpxCacher.java;h=9ab8552e771cef536d8e942c17948f6d98fe3e65;hp=0000000000000000000000000000000000000000;hb=ce6f2161b8596f7018d6a76bff79bc9e571f35fd;hpb=2d8cb72e84d5cc1089ce77baf1e34ea3ea2f8465

diff --git a/src/tim/prune/save/xml/GpxCacher.java b/src/tim/prune/save/xml/GpxCacher.java
new file mode 100644
index 0000000..9ab8552
--- /dev/null
+++ b/src/tim/prune/save/xml/GpxCacher.java
@@ -0,0 +1,142 @@
+package tim.prune.save.xml;
+
+import java.io.BufferedInputStream;
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.InputStream;
+import java.util.zip.GZIPInputStream;
+import java.util.zip.ZipEntry;
+import java.util.zip.ZipInputStream;
+
+import tim.prune.data.DataPoint;
+import tim.prune.data.SourceInfo;
+
+/**
+ * Class to read in a GPX file and cache all the point strings
+ */
+public class GpxCacher implements TagReceiver
+{
+	private SourceInfo _sourceInfo = null;
+	private String _headerString = null;
+	private String[] _strings = null;
+	private int _pointNum = 0;
+
+
+	/**
+	 * Constructor
+	 * @param inSourceInfo source information
+	 */
+	public GpxCacher(SourceInfo inInfo)
+	{
+		_sourceInfo = inInfo;
+		_strings = new String[inInfo.getNumPoints()];
+		_pointNum = 0;
+		// Should be a gpx file, but might be raw, zipped or gzipped
+		File gpxFile = inInfo.getFile();
+		String fileName = gpxFile.getName().toLowerCase();
+		if (gpxFile.exists() && gpxFile.canRead())
+		{
+			GpxSlicer slicer = new GpxSlicer(this);
+			InputStream istream = null;
+			BufferedInputStream bstream = null;
+			try {
+				if (fileName.endsWith(".gpx") || fileName.endsWith(".xml")) {
+					istream = new FileInputStream(inInfo.getFile());
+				}
+				else if (fileName.endsWith(".zip")) {
+					istream = getZipInputStream(inInfo.getFile());
+				}
+				else if (fileName.endsWith(".gz")) {
+					istream = new GZIPInputStream(new FileInputStream(inInfo.getFile()));
+				}
+				else {
+					System.out.println("GpxCacher unrecognised file type: " + inInfo.getFile().getName());
+				}
+				if (istream != null) {
+					bstream = new BufferedInputStream(istream);
+					slicer.slice(bstream);
+					bstream.close();
+				}
+			} catch (Exception e) {
+				// TODO: Handle errors here with a list of warnings?
+				e.printStackTrace();
+			}
+		}
+	}
+
+	/**
+	 * Accept a tag from the slicer
+	 */
+	public void reportTag(String inTag)
+	{
+		if (_headerString == null) {
+			_headerString = inTag;
+		}
+		else if (_strings != null)
+		{
+			if (_pointNum < _strings.length)
+			{
+				_strings[_pointNum] = inTag;
+				_pointNum++;
+			}
+			else
+			{
+				// _pointNum has got too high for the strings array
+				// This means the cacher has failed, probably by invalid points - need to give up caching here
+				_strings = null;
+			}
+		}
+	}
+
+
+	/**
+	 * @return the header string from the GPX tag
+	 */
+	public String getHeaderString()
+	{
+		return _headerString;
+	}
+
+	/**
+	 * Get the source string for the given point
+	 * @param inPoint point to retrieve
+	 * @return string if found, otherwise null
+	 */
+	public String getSourceString(DataPoint inPoint)
+	{
+		int index = _sourceInfo.getIndex(inPoint);
+		if (_strings != null && index >= 0 && index < _strings.length) {
+			return _strings[index];
+		}
+		return null;
+	}
+
+	/**
+	 * Get an inputstream of a GPX file inside a zip
+	 * @param inFile File object describing zip file
+	 * @return input stream for Xml parser
+	 */
+	private static InputStream getZipInputStream(File inFile)
+	{
+		try
+		{
+			ZipInputStream zis = new ZipInputStream(new FileInputStream(inFile));
+			while (zis.available() > 0)
+			{
+				ZipEntry entry = zis.getNextEntry();
+				String entryName = entry.toString();
+				if (entryName != null && entryName.length() > 4)
+				{
+					String suffix = entryName.substring(entryName.length()-4).toLowerCase();
+					if (suffix.equals(".gpx") || suffix.equals(".xml")) {
+						// First matching file so must be gpx
+						return zis;
+					}
+				}
+			}
+		}
+		catch (Exception e) {} // ignore errors
+		// not found - error!
+		return null;
+	}
+}